Method of manufacturing elastic helical gear-wheel.



Cu STEENSTRUP. METHGD OF MANUFACTURING ELA'SHC HELICAL GEAR WHEELS.

APPLICA'I'ION HLED HOV- 9; I9] 7.

iiatented. (m. 8,1918.

' Inventof: Christian Steenstru T .4; H is OGUQWSH! ESBATE T QFFICE;

orrmsrx'nn srnmqs'riwr; or sonnnnornnr, NEW YonK, ASSIGNOB 'ro GENERAL plnpnornIc ooMrnm,-A oonronnrron or NEW roan.

mn'rfidn or .iitmuracrunrne ELASTIC 'rmmonn onnnrwnnntsf igfesonoe.

Application-filed November 9, 1917. Serial No. 201,018.

.Taellwhomit may concern; Be it known that L-Cmus'rmn S'rnnn- Ge'aFWheels, of which the following is a "specification.

The present inventionv relates to an inn proved method of mahufacturinp, elastic the disks orlamim w I 1S rmed mustbe backed up so helical gear wheels of: the type which comprisesa plurality of disks or laminae fixed at their central portions on a common support or' shaft, and slightly spaced apart at their-peripheries to permit of axial yieldin under tooth pressure. The teeth on. suc

gear wheels must necessarily be cut with the plates assembled in order to insure that they are correct; It" is'not possible, however, to cut the teeth on the disks with the. peripheral portionsspaced apart, as they would yield and vibrate under the pressure of the cutting'tool-fto's'uchmn extent that .ceth

would not be true. 'In other words, when the teeth are being out the peripl'ieries of 'l' which the gear Wheel as to present a solid blank tor cutting. h M

The object of the present invention 1s to provide an improved method or manufac' turing such gear wheels according to which thedisks or laminae are backed up in animproved manner during the tooth cutting op eration so that the teeth may be cut on what is in substance a solid blank.

Fora consideration of What I believ'eto be novel and my invention, attention is dirooted to the accompanying specification an the claims appended thereto.

In the drawing, Figure 1 is an end elevation a gear wheel blank and certain apparatus which may be used in carrying out the improved method; -Fig. 2 is a section taken on line 2-2,'Fig. 1; Fig. 3 is a radial sectional view-on an enlarged scale of a portlon of a. gear wheel. illustratlnp: certam' stepsof the method, and Fig. 4c is a side 'view. partly in section of a finished gear whee].

According to my improved method the plates, disks or laminae are formed to the dimension desired in the finished wheel, assembled 'on a shaft or holder, and fastened into place; This forms the gear wheel blank a relatively low'melting point. pic, I have found alloys of bismuth, lead and Specification of Letters Patent.

Patented 0013i. 8, 1918.

and it would have the appearance as shown n Fig. 4:, except that. there are no teeth on 1t. 5 indicates-the plates, disks or lan'iinae,

and 6 a holder upon which they are bolted between two collars 7 bybolts 8, one of such.

collars being formed integral with the wider at their outer .portions'than at their bottoms. This may be accomplished as shown in Figs. 2, 3 and 4 by tapering .the peripheral portions of the disks either on one or both sides. are shown as being tapered on both sides, thus forming spaces'which are V-shaped in radial section, already stated, however, this is much exaggerated in the drawing. The webs or central portions of the disks 5 are thinner thanthe hubs and the peripheral portions which leave chambers 12 between the webs with which the spaces 11 communicate.

After the blank is assembled. I fill the spaces 11 with a substance 13 which has a .melting point lower than that of the mate- In the present instance they preferably use'a substance which is hard. at.

ordinary atmospheric temperature and has For examtin. or of bismuth, lead tin and cadmium, which alloys are ordinarily known as fusi ble metal, satisfactory. Such an alloy is sufliciently'hard at ordinary atmospheric temperatures to firmly back up the disks while the teeth are being cut," and has a low melting point, the melting point depending on the proportion of the metals. in the alloy as iswell known. I preferably employ suc an alloy having a melting point'lowerthan the boiling temperature of water. 'A' temperature of 90 C. is satisfactory. The.s11bstance 13 is poured in, the spaces 11 in a molten state and allowed to cool and harden and to eonlinethe substance to thespaoes l1 and prevent it running ilown into the chair M1 312 T form a (hurl at. the bottom of each ibllgllllbfi compressed reiulily to fit the bottom oftlie' s'peees 1]. whieh maybe not of uniform width at all points around the wheel. (Jne. two or more turns of the cord or other eimilar Illili'fli'lill may be. utilized as found desirable. The purpose of making the Spaces 1.1. wider at the radial. outer portion than at th ir radially inner ends or bottoms to permit. ol' the F rmly inliroiluiplion ol' the. cord and of the \Ymlging at it lorfn into llll? bottoms of the mo e: 11. it ulso i'ui'll' 'i'nli-s its removal.

To facilitate llieiul'im'llwll m (if Elli: Sil -1' stance ll'lIll-O the were: ll. .l plece i Suitable incl lies; shown in Figs. 1. and 2 around theiblii-nhh This hand nut he Illkitl of thin go- -xnetal orhothiu. suital'ile n'mterml, and is pro- -V1Eld it its ends with mean for clamping it the present Mr tiglitl-V'around the blank.

- tenoe the ends of the hand are shown asbei ig fuete e5 Which 1 5- illihe top.

necl. to a pair of hinged members lfi I ay be squeezed together by bolts 17 to bring the'hanil tightl EUOllIlLl the blank.

The hand 15 is proi itlecl with a transverseopening 18 over which fitted 2i cap 19 to form :1 lill ngz chamber. ("onneot-etl to the lillil'ig vimn'ihma pipe or conduit 2-0 having ll mmel 2i at its free end. At :1 point. about urmu=lri=rixll opposite to the/traine- 'forn'i an air discharge cluunhor. Communh outing with [his vhai'nbor is'zi -;h.ort discharge pipe 24-. The lljlll'lHYkl'hW openings 15 21ml are sh wn in F 0! a, wiilih Huliieient l'o include all 02' hi quires 11. To introduce the molten lliltimizll into the SIXUZ'OS 11 the lm iul 13 i; n into place on the blank as .Klwu'n in l i l umii. Eillll lilo hlnuh lie-hi in pumtzm: no that the liliin imml'ier is :itw lmlloui nmlthe (llhiflxil.ll'l5 pipe 2% The umlirn rillliHllIilllil i-. {hen winked into th .l'uunel 1 1]. l'roiu \Vlll 'll it run. down. through the pipe or uoniluil. i l will up int-o the games ll. [he .l'uunvl 'llllll i j hold at a higher level than the top in' thililuuli'. Tlhnpurpoae of introducing the molten sul'r hil-i ltilizil the hot-tom of l.ll3 l')llll1li' is to pro-- \a-HE the. formation of air POLlUFt-m. this arr-uugomont is air driven up ahead of the mo. .1 substance as it flows into hr sum-0&- Ll anti-is tllaffhzugctl through rue pipe inserted in abath lVith 24. To prevent chilling Iiin'g-Yof the molten substance While it is 'bein'gpoui'ed; into the spaces 11, the geerhkAILkQmey-beQ heated to a. desired degree.- by it into a hothulh' or -othe.1 wise; For x'aihple,

in the case of it substance- 13 ,yvh l1 lies a i melting pointlower than; the boiling te" perature of watenthe entirefb'lunliz may Wit her and heated to e teir peratiire 5 iii 'iently high to prevent the hil-lini-"encl hardening of the molten substitute.

thas b and allowed to cool, which will IeSll'lt in the hardening of the subE-tanee 13. -Afterft/he substance 1.3 has hardeneglthebe'nd' l5 .i-s' removed and the teeth are out on' the blank in the usual manner. The gear Wheel then heated by placing it in a hot loath or otherwise to melt out the material; 13 after which (he wires, strings or 001115 14 are removed, low-lug a. ((Hl'llJlQliHl geurwhoel, as shown in Fig. 4 In the case where a substance 13 used having a melting point lower thantheteni 'm-rzzt-ure of boiling water, the wheel can conveniently be l-llllllfilSBCl' in l melt the substance 13;. It stood, however, that it: may

Thealmve-desijirilied n1 had"lies;tliie aiitained in the exact poeition's duri 11g. the tooth rut-ting operation Whichthey will occupy in the finished-gear wheel and there lent-comb ingly no dangei-go'f their springinger nuning on the renu'w'a]. of the v nmterial which hacks them u-p'during't'he cutting operation. In other words, there is no (len'gerof any of H16 disks being held wider tension or romprerssion during the cutting operation. It may occur, forexarxaplei t=l1iit-eome of the rlisks or plates; are slightly warped. or sprung. Or they may have. inaeeuraeies near the peripheries. llndei these. i stances the disks may beslightly c1; v eeeh other at some pointserou'nd the, pe} ripheriee than at others. The string, coril,

pressed and deformed to fit int m1: thespeqes .11 zireeutirely filled the blunkJ I heatedany i other my founcl des able ;or*etlva.ntegeous.

11 at any point. This is illiwtiruld-in an..

ex ziggernted munner in Fig. 3. molten. substance or IIHLl30flll'l.= l3 l1'l(.- ll} :l$ pourei'l in will fill the spaeeia l1? lowing the hu-i or disks in their nor-i 'ml positions. ll.- Folious. therefore. the (lisk ixell the mine relative positions intlie linr isheil gear wheel that they 'omau'pierl. (luring the (cutting operations.

In ueeordiuu-o with the provisions ezirry i ng it. out wgetherwith su'i-tahl e apparatus which may utilized; but I desire to E ing dance in outside the 80 have it understood that the particular method and apparatus shown is onl illustrativ'e, and that the invention can e carried out in other ways such as come within the scope of the appended claims.

What I claim as new and desire to secure byLetters Patent of the United States, is 1.- The method of manufacturing gear wheels comprising a plurality of disks clamped together at their central portions and slightly spaced. apart at their peripheries, which comprises assembling the disks on a holder to 'form a blank having spaces between the disks at' their eripheries, placsaid spaces, lling the spaces dams with a'molten substance which has a lower melting-point than the material of which the disks are formed, outting. teeth on the blank after the filling sub wheels comprising a plurality 0 I- stance has hardened, and. removing said filling substance by heating.

3. The method or manufacturing wheels comprising a plurality of disks clamped together at, their central portions and sllghtly spaced apart at their periph cries, which comprises assembling the finished disks on. a holder to form a blank havingspaces between the disks at their pcripheries, inserting strands in said spaces to form'dams, placing a band having a filling opening around theblank, pouring a molten substance which has a lower melting point than the material of which the disks are formed into said filling opening from which it runs into said spaces, removing the band after said substance has hardcned, cutting teeth on the blank, removing said fillin substance by heating, and removing said strands. i

4. The method of marrhfaeturinfg gear 4 disks clamped together at their centgak portions and sli h 1y spaced apart hit their periphcries, w ich comprises finishing the disks so that they havea slight taper at itheir outer portions, assembling the disks ito form a blank with spaces between theiriouter portions which are wider at the periphery of the wheel than at their bottoms, placing mem bers at theflbottoms of said spaces to form dams, filling the spaces with a metal which is {hard at ordmary temperatures and which melting pointthan the material (gear JSkS Y ducing a molten melts at a relatively low temperature, cutting teeth on the blank, removing said filling it until it melts, and re;

metal byheating moving said dams.

5. The method of manufacturing gear wheels comprising a plurality of disks clamped together at their central portion and slightly spaced apart at their periphcries, which comprises assembling thedisks to form a blank, placing a band having a filling opening around "the blank,- introdue ing a molten. substance through said filling opening into the spaces between 'thedi'sks, removing said band after thefsubstance has hardened, cutting teeth on. theblank, and removing said filling substanceby? melting it.

6. The method of wheels comprising a, clamped together at their and slightly spaced apart at their peripheries, which comprises assemblin the disks to form a blank, placing a ban havinga filling opening at its bottom, and a vent opening at its top around the blank, introsubstance through said filling opening into the spaces between the disks, removing said band alter the sub stancehas hardened, cutting teeth on the blank, and removing said fi by melting it.

7. The method wheels comprising central portions of manufacturing car a plurality of isks -manufactur1ng gear. phirahty' of, disks ling. substance clamped together tit-their central portions and slightly spaced apart at their-peripheries, which comprises assembling the disks to form a blank, filling the spaces between the peripheries of the disks with a substance which fuses at a low temperature, cutting teeth on the blank, and removing said filling substance by immersing the hot bath to melt the filling su stance.

8. The method of manufacturing gear ar wheel in a wheels comprising a plurality of disks clamped together apd slightly spaced apart at their peripheries, which compr'ses assemblin the disks to form a blank, llacing a ban having filling opening around the blank, immersing the blank in a hot bath, introducing a molten substance through said filling opening Into ,the sp ces between the disks, removing the blank rom the bath andpermitting it to cool and thesubstance to harden, removing the'band, cutting teeth on the blank, maim- -mersin the gear wheel in a' hot bath to melt the filling material. i

9. The method at their central portions "of manufacturinfg' wheels comprising a plgrality o '11s'lts,

clamped together at their central portions; I

III.

and slightly spaced apart-at their periph cries, which comprises assembling thedlsks to iormla blank, fillin the spaces between the peripheries 'of the iskslwith a substance which fuses at a temperature lower than boiling temperature of water, cutting tee 1 tin on Lllo blank, and removing said fillin by,

Clill'lllu' l together at their central portions and nightly spaced apart at their periph-' levies, \vliichzeom'prisesassembling the disks to"fo1m :i blank, placing at band having 2/ i'lling opening around the blank, introduc- "mg a molten substance through snizl filling opening;- into the speeesbetween the disks,

said band after the substance has Hitting teeth on the blank, and said filling substance.

method of manufacturing gear removing: harclenr-wh renmv i ng ll The -mh eels comprising a plurality of disks elernped together at their central portions 13ml slightly spaced apart at their peripheries, "which 'colhprises assembling the disks with a subetanee between the peripheries of .thernwiihich ha sjzi meltingtempe'rature lower than that of .theqneterial. ofwh'ieb the disks,

and slightlysp'ececl apert'etfl'their peripln e'ries, which con' prisee -a;S$'emblin the disks to form a blank, pl-ae ing'e ban filling opening around the. blank, heating said blank, introduciijig a. molten substance through said filling opening into the spaces between the disks, removing said'band after the substance has hardened, cutting teeth. on the blank, and removing said filling enbstance.

In witness whereof, I. have hereunto set my hand this-6th deof November 1917.

I CHRISTIA. STEENSTRUP.

having a clampedtogether. et the ir ei'ltr'al. -'portions 3U 

